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[函数] 联考卷中的代数式求值

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math505 posted 2022-12-10 18:04 from mobile |Read mode
Last edited by math505 2022-12-10 18:30$a,b,x,y>0,(x-a)^2+(y-b)^2=x^2+b^2=a^2+y^2,by-y^2=ax-x^2$,求$\dfrac{a+b}{x+y}$的值.

答案用的是数形结合法,有没有纯代数方法?

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kuing posted 2022-12-10 18:24
有点怀疑第二个括号是 `(y-b)^2`

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original poster math505 posted 2022-12-10 18:31
kuing 发表于 2022-12-10 18:24
有点怀疑第二个括号是 `(y-b)^2`
真不好意思,打错了。。

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original poster math505 posted 2022-12-11 09:08
有大神能解答吗?

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